Friction draft rigging



July 1 1,924

1,499,353 G. B. maar FR'IGTION DRAFT- RIQGING Filed Dec. 14 1921 www WITNESSES INVENTOR gfl 'v v QW Patented .luiy l., i924.

stares ser nr erstes@ GEORGE BINET DOREY` 0F MONTREAL, iQUEBEC, CANADA, ASSIGNOR T0 WILLIAM H. MINEFI, CRAZY, NEW AYORK.

FBICTION DRAFT RIGGNG.

Application filedvDecember 14, 1921. Serial No. 522,383.

fo all 'zu/wm, t may conce/in:

Be it known that l, Gnomi; BINET Dormi',

a subject of thelingI oli' Great Britain, and ,residing in the city el liiontreal, Province of -Quebec, Dominion ol Canada, have invented certain new and -useiful flnipr'oven'ients in Friction Draft Riggin nd do hereby de Clare the following to hJ a inll, clear.- and exact description of the saine.

My invention relatesto improvements in drie-tion draft vriggings and is especially related to that type wherein ywedge blocks having longitudinal movement Vaswell as. transverse nioven'ient are used to displace other frietional inen'ibers'a relatively greater disi tance.

It is an object of the present invention to' greatly increase the capacity and shock absorbing power of such gears by providing auxiliary wedgiug means to insure a more certain Aw'edging action betweenthe various wedging elements. v

A. furthcrob'ject of the invention resides inl providing novel means to cause springs having `varying degreesof travel to he eompressed in unison.

Another object ot the invention is to in` sure more certain release oi the gear after compression by 'having certain of the parts constituting the frictional portion of the rigging directly resisted hy the springs.

A ilitliculty hitherto exl'ierienced with high ,capacity ilriction gears has rbeenthe bending ol' members subjected toloading as a colnnni and it is an object ol this invention to so dispose the various elements usually sul4 'jected to bending stresses that they will work in tension instead ot compression.

My invention lnrther consists of certain 'i'iovelties oi' design and cmistruetion and coinbinationol' parts such as will be apparent lron'i the description in this specification and reference to lin, drawings.

For fuller comprehension of the invention. reference must he had to the accompanying drawings wherein like ligures indicate like parts.4 i i ln the illustrations liigure l shows the draft rigging as ap )lied between the sills of a railway car with the parts in the nornial release position.

,Figure 2 is the saine as Figure 1, exceptthat the rigging is shown in the fully compressed position.

Figure vS'is a transverse sectional View taken on line 2-2 of Figure 2.

Figure fl is a perspective View of the friction follower member.

Figure 5 is a. perspective view showing the inner face of one of the shoes.

Figure 6 is a perspective view showing the outer face of one of the shoes.

Figure 7v is a perspective View ofone oit?,v lie wedge block pressure transmitting inem;`

ers. y

Figure 8 is a perspective view of the Wedge retaining member.

Yln the drawings 2 represents the drawbar of the coupler connected by means of key 3 to the yoke 4 in the usual manner, the yoke embracing the easing 5 and the Whole being located between center sills 6. The rear of the casing abuts against rear stops 7 eon- .nected to the center sills by means of rivets 'l'he casing 5 as shown 0n the drawing is preferably rectangular in shspeand mede of pressed steel and consists of an outer shell 1l, the side walls being fitted with inserts 1:2v vwhich are provided with .lugs 13 thereby making a rigid connectionwith the outer easing. The easing is made with one end closed as at 14 on which the cluster of' springs bear. The open end of the casing is formed with oppositely beveled pieces 15 which extend within the-casing. Cooperating with surfaces l5 of the casing are two wedge block pressure transmitting members 16 disposed onveaeh side of the longitudinal center of the gear. These wedges are made triangular in shape, each side constituting a friction. surface, surface 17 being adapted to register with surface 15 of the casing, the adjacent surface 18 of' the wedge co-aeting with surface 35 of the friction lshoes 32. lhe other surface of the ,wedge as at 19 is adapted to register with surface 21 of the friction follower member 21. A recess is l'ornied in the wed/ge block pressure transmitting members at 20 for the purpose of straddling the-depending portion of the friction member when the gear is compressed.

The follower member 21 is T shaped 'in form with the leg 22 forming a depending l portion extending Within the casing. The leg-22 is provided with two friction surfaces 22a which are preferably parallel and adapted to register with friction surfaces 34 of the shoes 32. Extending longitudinally through the follower member is a hole through which the bolt 37 passes, the hole is enlarged at its upper end as shown at 21 to form a chamber for the nut 38 and in order to enable the nut t'o be turned'. The purpose of this bolt is to bolt .the gear together and so place the springs under init1al compression and so prod uce a self contained ear. g The inner end of the follower member as at 25 bears directly on the linner coils of springs consist/ing of coils 26 and 27. .The

'outer coil of springs 28 bears directly on the wedge retaining member 29 at surface 3 0. The wedge retaining member ispreferably formed of rectangular section and hollowed out for the purpose of receiving the shoes 32 andthe walls engaging this member are sloping as at 31 registering with the wedging surface 33 of the shoes 32.

The inner surface 34 of the-shoes is preferably made fiat and registers with the outer surface 22?* of the follower member 22 and it will therefore be seen that pressure from the outer spring 28 will force the wedge re ytaining member tightly over the wedge shaped portion of the shoes thereby tending to drive these members with great force against the depending portion'of the follower member. This action'is further augmented by the wedge shaped portion of the outer ends of the shoes, asI constituted by surfaces 35 which registering with surfaces 18 of the wedge blocks 1,6 cause the shoes to move towards each other, as the shoes are dis osed on each side of the longitudinal cenl er of the rigging between the wedging surfaces of blocks 16.

In order to cause the shoes to move in unison they areformed L shaped by means of the projections 36 extendingr over the column and ,from the main body of the shoes. These lugs are formedv on .both the top and the bottom of theyshoes but disposed in different planes in order that. they may interlock whenfplacedfin operative relation, one of such lugs preventing longi-A tudinall relative motion between the shoes in one direction and the othenlug preventing relative motion between the shoes in the opposite direction. o

The operation of the draft rigging takes' place as follows. ln draft yor butling strains the follower member 2l is moved towards transmitting members 16 inwardly into the A casing and by the fact of the beveled walls 'of Avthe casing also transversely of the same andtowards each other. As members 16 move towards each other they displace the friction shoes 32 a greater distance than their own movement due to the squeezing action exerted on these members by the relative approach of surfaces 18 towards the longitudinal center of the gear. The squeezing action referred to' has the effect of forcing the shoes tightly against the leg of the follower member 21 and this action' is further augmented by the action of the wedge ,retainin member 29 being forced over the wedge s iaped. portion ofthe shoes by the spring 29. It will be observed ,therefore that the shoes will move a greaterdistance than the coupler and the follower member and that there will be relative motion between the shoesfand the follower member and as the former are'travelling at a. faster rate of speed than the follower it is evidentv bearing at surface 25 directly o pose in ,ward movement of the follower. hen the gear -is fully compressed the surface 21a abuts directly on the casing" thereby relieving the frictional mechanism of undue strain. f

On release of the parts thev'inner coils of spring acting on the follower member force it outwardly and at the same time the outer coil springreasserts itself and moves the shoes forward on the friction member. As the shoes are being moved forwardly the wedge block pressure transmitting members 16 are also moved in a forward and outward direction thereby bringing back the parts to the normal release position of the gear and in readiness for the next compression stroke.

.While I have shown one particular embodiment of my invention it is evident that certain changes and modifications may be lmade without departing from the spirit and portion having substantially parallel faces ini.

and frictional shoes in engagement therewith, wedge members in engagement with the casing and adapted to move the shoes transversely and longitudinally.

Il. A friction draft rigging comprising a casing, a follower having a depending portion extending therefrom and frictional shoes having parallel facesin engagement therewith, wedge members in engagement .with the casing and adapted to move the shoes relatively to the follower.

A friction draft rigging'comprising a casing, a follower having a depending portion extending therefrom and presenting walls, friction shoes in engagement; with the said walls and-wedge pressure transmitting .members engageable with the follower and adapted to move transversely and inwardly upon relative approach of said follower and casing and adapted to displace the shoes relatively to the follower.

' 6. A friction draft rigging comprising a casing, a follower, pressure transmitting menlbcrs operatively associated with the casing and adapted to move longitudinally and transversely and friction elements opposing the movement thereof, the said elements comprising friction shoes in engagement with walls extending from the follower, wedging means for holding the shoes in engagement therewith and moving the same relatively thereto 'and spring means for maintaining the parts-in operative relation. 7. A friction. draft rigging cox-uprising a follower, a casing presenting oppositely beveled walls, wedge blocks in engagement therewith, friction. shoes adapted to be displaced by the wedge blocks, the said shoes being formed with exterior wedge shaped surfaces at both their outer and inner ends; the onlcr ends of such shoes having the wedge shaped portion re-'acting against the casing through the medium of wedge blocks and the other end of such shoes re-act-ing against an integral movable member; the said shoes being formed with interior parallel walls and havingr an extension from the follower adapted to have reciprocatory motion therebetween.

8. A friction draft rigging comprising a casing having beveled walls wedge blocks in engagement lwith the said beveled walls, friction members adapted to be displaced by the said wedge blocks, a follower acting on the Wedge blocks and spring means directly resisting movement of the follower and .spring'means directly resisting movement of the friction members.

9. A. friction draft rigging having a follower, wedgel blocks, friction shoeshaving parallel faces, a memberextending from the follower and being adapted to have iecipro4 catory motion between the parallel faces of the friction shoes and spring means directly resisting movement of the follower and spring means directly resisting niovemcnt of the shoes.

10. in a friction draft rigging the comoia, on with a drawbar of a plurality of springs, a member in engagement with certain of the springsand travelling at drawbar speed, frictional members in engagement with theJ aforesaid member and travelling at a greater speed than the drawbar and resisted by the other springs.

lLIna friction draft rigging the combination with a drawbar of inner and outer springs, a member resisted by the inner springs and adapted to travel at drawbar speed, -frictional members in engagement with the said member and travelling at a greater speed than the drawbar and resisted by the outer spring.

12. In a friction draft rigging, a casing,

a tensional member and movable shoes sllding thereon, the said shoes having one end thereof formed wedge shaped and engaging movable wedge blocks ctn-operating with the casing to force the said shoes against the `tensional member and also inwardly into the casing; the other end of the shoes being also wedge shaped and engaged by a similarly wedge shaped movable member formed to resist outward movement of the shoes and adapted to force the same into engagement with the said tensional member and spring means adapted to maintain the wedge shaped member over the shoes and resist inward movement of the said shoes and movable member. l

13. A friction draft rigging having a casing, friction shoes, a friction member and transversely and longitudinally movable wedge blocks co-operating with thecasing `to displace the friction shoes relative-ly to the friction member, means for maintaining the friction shoes in engagement with the said member and a spring for resisting movement of the parts; the said member being under tensional strain during such. displacement.

14e. In a friction shock absorbing mechu anism, the combination with a friction shell; of a spring resistance; a follower, the follower having an extension projecting within. the shell, the distance between said projection and a side of the shell protfrressively decreasing inwardly of the shelljand a plurality of frictionl elements on each side of said projection between it and thecorresponding adjacent shell friction surface and cooperable with the follower, its projectionand the shell.

its

l5. In a vvfriction shock absorbing mechltter, the followe proper and the corre- 10 'anisnn the combination with :L friction shell sponding shell friction surfaces.

having opposed friction Surfaces on the in- In testimony whereof Ivhave hereunto set tcrioithereof converged inwardly of thel my hand 1n the presence of tWo Wltnesses. i shell; of a spi-ing resistance; :in outer ollower having n centrally disposed arm ex- GEORGE BINET DOREY. tending between Suid Shell friction surfaces Witnesses:

and n pair of wedge-friction-shocs 'on each R: GORDON, 51de of sind arm and coopcrahle with the EDGAR G. DOLBY. 

